Investigation On Flow And Heat Transfer Characteristics Of Decoction Pot Inserted With Screens Porous Media

Traditional Chinese medicine(TCM)is a cultural treasure of the Chinese nation.Its unique curative effect and few side effects are highly praised by patients all over the world.But the method of traditional Chinese medicine is very exquisite,from the apparatus to the heat,after the first down.The traditional way of decoction by hand is to use the medicine pot in the open state,which makes the quality of decoction and the rational utilization of energy become two major problems in the decoction process of industrial traditional Chinese medicine.With the development of modern science and technology and the increasing living standards people demand,at this stage the decoction of technology is increasingly perfect,appeared a decoction Pot built-in wire mesh porous media replace traditional built-in tisanes decoction in-the form of equipment,not only can improve the extracting effective ingredients of drugs,and solved in the process of tisanes,mixing drugs plastering not in time.However,in the process of decocting technology,this equipment loses a lot of heat in the process of energy transfer.In order to find a more optimized structure type of mesh porous media to improve the energy utilization efficiency,to adapt to the needs of the pharmacy and other engineering requirements,especially to meet the requirements of the harsh decocting method in the process of decocting,which makes the research on the mesh porous media based on the pot is particularly important.Based on the above decocting equipment,this paper first carried out a large number of numerical studies on the single-phase flow field characteristics of the mesh porous medium channel.The structure parameters of the mesh porous medium selected in the calculation are different,which are 10 mesh,20 mesh,30 mesh,40 mesh and 50 mesh,and the corresponding porosity range is 75.6%?88.3%.In the numerical study of mesh porous media channels,the simplified analysis of cross-scale porous media model was innovatively proposed,and the pore level unit model of mesh porous media was constructed.The CFD software was used to establish the 3d steady-state standard turbulence model to ensure the computational accuracy.According to the results of numerical analysis,the flow resistance characteristics of the pore channel in different configurations are obtained,which lays a foundation for the design and research of the exchange of porous media in porous medium in the multi-layer decocting pot.In the aspect of numerical simulation of the characteristics of single phase flow field in two dimensional mesh medium,the numerical methods of other types of porous media are systematically used for reference by using the existing computational benchmark of fluid flow in the mesh medium.By means of the criterion of equivalent transformation,and puts forward the 2d screen hole medium model,research under different velocity and different configurations of a two-dimensional flow field pressure drop wire mesh porous medium model,and find out the 2d and 3d numerical calculation the similarities and differences between,summed up the two-dimensional model of fluid flow within the screen hole medium channels in the advantages and disadvantages.Single-phase flow of porous media on the mezzanine heat exchanger and heat transfer mechanism,the numerical simulation of computational domain with water as working media,to use its expression in thermal and physical properties,combined with the first two chapters of wire mesh porous media flow resistance characteristics of dimension transformation rules,rule and model constructed sandwich heat exchanger two-dimensional porous medium full scale model,multi-scale model and mastered the jumper meshing technique,will screen porous medium micron grade unit grid and mainstream area meters reasonable cohesion level unit grid,finally obtained based on the built-in screen type,different structural parameters,wall distance of substance in on decoction pot coupling heat transfer characteristics are studied.The research results provide theoretical support for the effective regulation of the flow field and temperature field in the decoction pot,and indicate the direction of the type,structure parameters and wall distance of the porous media in the boiler during the engineering design process.Compared in this paper,the numerical research and test data validate the means of combining based on traditional Chinese medicine decoction equipment production technology of energy saving optimization requirements,in-depth study the decoction pot built-in screen channel flow and heat transfer characteristics of porous media,mastery of the structure parameters,types of wire mesh and the spatial location on the influence law of the thermal-hydraulic decoction Pot,clear indications wire mesh porous media channel flow resistance,pressure drop empirical reveals decoction Pot wire mesh inside the influence law of flow resistance on its heat transfer performance,provide the basis for optimizing decoction pot inside mesh porous structure,to reduce the energy consumption in the decoction process,It has strong theoretical significance and engineering application value.